The greatest part of GoPro's marketing is their youtube page. They just post videos shot with GoPros and like amateur versions of the same. I go there when I'm feeling like I need a taste of the outdoors and I've also got a GoPro on order, coincidence? Maybe but probably not.
Also note that their (free) video software make creating this style of video incredibly easy, and just happens to have a pre-reel "GoPro" trailer by default. Everyone leaves it in because they want their video to "look pro".
